Prometheus MCP Server

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List Available Metrics

list_metrics

Read-onlyIdempotent

Retrieve all available Prometheus metrics with support for pagination and name filtering to efficiently browse the metric catalog.

Instructions

List all available metrics in Prometheus with optional pagination support

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "list_metrics"
  }
}

Input Schema

Name	Required	Description	Default
`limit`	No
`offset`	No
`filter_pattern`	No
`refresh_cache`	No

Output Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

Changed5 schema fields changedv1.2.2May 1, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
- removedInput schema / properties / filter_pattern / title
```
Removed value: -"Filter Pattern"
```
- removedInput schema / properties / limit / title
```
Removed value: -"Limit"
```
- removedInput schema / properties / offset / title
```
Removed value: -"Offset"
```
- addedInput schema / properties / refresh_cache
```
Added value: +{
+  "default": false,
+  "type": "boolean"
+}
```

Changed5 schema fields changedv1.0.0Jan 3, 2026

addedInput schema / properties / filter_pattern

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Filter Pattern"
+}

addedInput schema / properties / limit

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "title": "Limit"
+}

addedInput schema / properties / offset

Added value: +{
+  "default": 0,
+  "title": "Offset",
+  "type": "integer"
+}

removedInput schema / title
```
Removed value: -"list_metricsArguments"
```

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": true,
+  "type": "object"
+}

First observedMay 3, 2025

TDQS

A3.7/5.0

Behavior3/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true, destructiveHint=false, and idempotentHint=true, so the description's note about pagination adds minor behavioral context but is not necessary for safety awareness. No contradictions with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single sentence of 10 words, directly stating the purpose and key feature. No unnecessary information.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The description does not cover the purpose of filter_pattern or refresh_cache, nor how pagination behaves (defaults, total count). Given 4 undocumented parameters, the description is incomplete for a full understanding.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters2/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%. The description only hints at pagination (limit/offset) but does not explain filter_pattern or refresh_cache. It fails to compensate for missing schema descriptions on 4 parameters.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states 'List all available metrics in Prometheus', specifying the exact resource and action. It distinguishes itself from sibling tools like execute_query and get_metric_metadata by focusing on enumeration of metrics.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description mentions optional pagination, indicating when to use pagination parameters. However, it lacks explicit guidance on when to use this tool versus alternatives like get_metric_metadata for detailed metric information.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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